The raft slides into the water which is is plenty deep even a few feet out. Checking the depth you find that after 10 feet it is at least 5ft deep and at 20 feet it is more then 10 feet deep. The raft is big enough for the 5 of you plus the dogs but Shoul, Rik and Mule will have to stay behind. What sort of plan do you foresee?

Is it time to shove off?

The lights again start up at some point mostly towards right side (East) of the cave system...

"Shoul, be a good lad and hand me your pack, it seems I will be providing light for this part of the trip. <hands him back 2 iron rations and tinder box> Stay warm, stay safe, we will return when we can."

"Let's call our raft the 'Water Ladder' since the logs are parallel, like a ladder," suggests the literal-minded Urist. If there are no objections from the party, he will grab hold of a pole and begin pushing the raft toward the mysterious lights...